refactor(API): 移除 code_execution 工具相关配置

- 用户注册时默认工具列表移除 code_execution
- 设置接口默认工具列表移除 code_execution
- 工具列表接口过滤掉 code_execution 工具

src/app/api/auth/register/route.ts

@@ -129,7 +129,7 @@ export async function POST(request: NextRequest) {
       cchApiKey: null,
       cchApiKeyConfigured: false,
       defaultModel: 'claude-sonnet-4-5-20250929',
-      defaultTools: ['web_search', 'code_execution', 'web_fetch'],
+      defaultTools: ['web_search', 'web_fetch'],
       theme: 'light',
       language: 'zh-CN',
       fontSize: 15,

src/app/api/settings/route.ts

@@ -11,7 +11,7 @@ const DEFAULT_SETTINGS = {
   cchApiKeyConfigured: false,
   apiFormat: 'claude' as 'claude' | 'openai', // API 格式：claude（原生）| openai（兼容）
   defaultModel: 'claude-sonnet-4-5-20250929',
-  defaultTools: ['web_search', 'code_execution', 'web_fetch'],
+  defaultTools: ['web_search', 'web_fetch'],
   systemPrompt: '',
   temperature: '0.7',
   theme: 'light',

src/app/api/tools/route.ts

@@ -11,7 +11,10 @@ export async function GET() {
       orderBy: [asc(tools.sortOrder)],
     });
 
-    return NextResponse.json(toolList);
+    // 过滤掉 code_execution 工具
+    const filteredTools = toolList.filter(tool => tool.toolId !== 'code_execution');
+
+    return NextResponse.json(filteredTools);
   } catch (error) {
     console.error('Failed to get tools:', error);
     return NextResponse.json(